JP4262852B2 - Oil combustor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, liquid fuel is ejected from a nozzle to collide with a vaporization wall provided in the vaporization chamber, and primary combustion air is supplied to the vaporization chamber, and the liquid fuel is heated by the heater and vaporized at the vaporization wall. The present invention relates to an oil combustor in which a mixed gas of a burned fuel and combustion primary air is led to a burner and burned.
[0002]
[Prior art]
Conventionally, an oil combustor that vaporizes kerosene and uses it as fuel is known for hot water heaters and hot water heaters. As an example, an oil combustor known from Japanese Patent No. 2924131 will be described with reference to FIG.
This oil combustor includes a vaporizing chamber 4 that vaporizes kerosene and mixes it with air, a mixing passage 9 that guides the mixed gas downward, and a uniform chamber 1 that guides the mixed gas from the mixing passage 9 to the rear (left side in the figure). And a burner 2 provided at the upper part of the uniform chamber 1 for burning the mixed gas.
[0003]
In the vaporizing chamber 4, a nozzle inlet 13 is opened at the top of the front wall 7, and an air inlet 11 is opened below the nozzle inlet 13. The nozzle inlet 13 is provided with a nozzle 14 that ejects kerosene to the inclined vaporization wall 6 that is inclined forward and downward on the back surface of the vaporization chamber 4. In addition, the inclined vaporization wall 6 includes a linear sheathed heater 10 and a fin 15 that collects part of the combustion heat of the burner 2.
Further, a fan 3 that sends air into the vaporizing chamber 4 is provided upstream of the air inlet 11.
[0004]
In the oil combustor configured in this manner, kerosene ejected from the nozzle 14 collides with the inclined vaporization wall 6 heated by the sheathed heater 10 and vaporizes while flowing down, and is introduced from the lower air inlet 11 and inclined vaporization. After mixing with the air rising along the wall 6, it passes through the mixing passage 9 and the uniform chamber 1 and burns in the burner 2.
During combustion, a part of the heat of the combustion gas is recovered by the fins 15 and the entire inclined vaporization wall 6 is heated to improve the vaporization ability.
[0005]
[Problems to be solved by the invention]
However, when kerosene flowed down along the inclined vaporization wall 6, it collided with the rising air, the flow was blocked and an oil pool was generated, and good vaporization was not performed.
When the amount of kerosene ejected is large, diffusion concentrates above the inclined vaporization wall 6 and diffuses to the ceiling wall 5 of the vaporization chamber 4 and the left and right side walls 8 of the vaporization chamber 4. The lower part was not used effectively as a vaporization surface.
As a result, at the lower part of the inclined vaporization wall 6, the amount of kerosene contact decreases, the temperature rises without taking away the latent heat of vaporization, and the temperature distribution of the inclined vaporization wall 6 becomes non-uniform, causing the vaporization chamber 4 to burn out. , Tar is generated, and the vaporization performance deteriorates.
On the other hand, at the upper part of the inclined vaporization wall 6 where the amount of kerosene contact is large, the wall surface temperature is likely to be lowered, heat necessary for evaporation cannot be obtained, and the once vaporized kerosene is deprived of latent heat and condensed due to the temperature drop .
Therefore, when a lot of kerosene was ejected, the vaporization performance was very poor.
Moreover, since the vaporizing chamber 4 is formed of a plurality of flat walls, it is formed at a corner formed between the inclined vaporizing wall 6 and the ceiling wall 5 or at a corner between the inclined vaporizing wall 6 and the left and right side walls 8. Kerosene was apt to stay and the liquid film of kerosene became thick and the vaporization efficiency was low.
[0006]
Further, in the oil combustor known from Japanese Patent Laid-Open No. 9-79520, as shown in FIG. 7, a vertical vaporization wall 8 serving as a kerosene collision surface is formed vertically, and the center of the lower portion of the vertical vaporization wall 8 is formed. Is provided with a guide wall 13 extending in the horizontal direction and smoothly dividing and guiding the mixed gas to the two inlets 7 at the bottom. Since FIG. 7 uses the figure of the publication, the reference numerals have no relation to the reference numerals used in other drawings.
However, in this oil combustion apparatus, since the collision surface is formed vertically, when the amount of kerosene ejected is large, the kerosene rebounds at the vertical vaporization wall 8 and falls to the guide plate 13, and thus the vertical vaporization wall 8. The contact time was shortened, resulting in poor vaporization.
Further, when the amount of kerosene ejected is small, it does not reach the vertical vaporization wall 8, and similarly falls onto the guide plate 13 as it is. Although the kerosene dropped on the guide plate 13 vaporizes to some extent, it accumulates at the corner between the vertical vaporization wall 8 and the guide plate 13, and the liquid film becomes thick and cannot be completely vaporized.
Then, the oil combustor of this invention aims at solving the said subject and diffusing liquid fuel to the whole vaporization surface, and improving vaporization efficiency.
[0007]
[Means for Solving the Problems]
The oil combustor according to claim 1 of the present invention for solving the above-mentioned problems is provided.
Liquid fuel was ejected from the nozzle and collided with a vaporization wall provided in the vaporization chamber, and primary air for combustion was supplied to the vaporization chamber, and the liquid fuel was heated by a heater to vaporize at the vaporization wall and vaporized. A vaporizing section for introducing a mixed gas of fuel and primary combustion air to a burner;
An oil combustor comprising a combustion section for combusting a mixed gas ejected from the burner,
A reflux plate for refluxing a part of the mixed gas to the nozzle side and circulating in the vaporizing chamber is formed in the vaporizing portion along the extending direction of the curved collision surface,
Forming a collision surface of the vaporization wall with which the liquid fuel collides, on a cylindrical inner surface or a spherical inner surface that is concave and curved in the liquid fuel ejection direction;
The gist of the invention is to supply the combustion primary air toward the curved collision surface so that the liquid fuel is spread along the collision surface.
[0008]
The oil combustor according to claim 2 is the oil combustor according to claim 1,
The gist of the invention is that the return plate is arranged directly under the liquid fuel ejection path from the nozzle to the vaporization wall, and a liquid fuel passage hole is opened at a contact portion of the return plate with the collision surface. .
[0009]
The oil combustor according to claim 3 is the oil combustor according to claim 1 or 2,
The gist is that the vaporization wall is curved in the vertical direction so that the axis of the cylindrical inner surface extends in the horizontal direction .
[0010]
Moreover, the oil combustor according to claim 4 is the oil combustor according to any one of claims 1 to 3 ,
The gist is that the vaporization wall is curved in the left-right direction so that the axis of the cylindrical inner surface extends in the up-down direction .
[0011]
The oil combustor according to claim 5 is the oil combustor according to claim 1 or 2 ,
The gist is that the vaporization wall is formed in a spherical shape .
[0012]
Moreover, the oil combustor according to claim 6 is the oil combustor according to any one of claims 1 to 5,
The gist is that the lower end of the curved vaporization wall is cut in the horizontal direction, and the lower end of the vaporization wall is bent toward the inside of the vaporization chamber .
[0014]
According to the oil combustor of the present invention having the above-described configuration, the liquid fuel ejected from the nozzle collides with the curved surface recessed in the ejection direction, and the primary air for combustion supplied toward the curved surface As a result, the gas is swept along the curved surface and diffused throughout the vaporized wall while effectively utilizing the vaporized area. As a result, the liquid fuel is prevented from bouncing back and collecting on the curved collision surface, and the liquid fuel film is thinned and vaporizes well on the vaporization wall heated by the heater.
The gas mixture of fuel and primary air thus vaporized well is guided from the vaporization section to the burner and burned in the combustion section, and heats the object to be heated such as a heat exchanger.
Further, a part of the fuel vaporized on the collision surface is sent to the burner, and the remaining fuel returns to the nozzle side along the curved reflux plate and circulates in the vaporization chamber. This vaporized fuel circulation keeps the vaporization chamber at a high temperature and promotes vaporization of the ejected liquid fuel.
[0015]
According to the oil combustor of the second aspect of the present invention having the above-described configuration , since the return plate is disposed at a position directly below the ejection path of the liquid fuel, the liquid fuel is simply placed away from the ejection path. It diffuses and vaporizes while flowing down along the vaporization wall.
On the other hand, the liquid fuel is vaporized while flowing down to the lower part of the vaporization wall through the liquid fuel passage hole of the reflux plate just below the ejection path, and is difficult to accumulate on the reflux plate.
A part of the fuel thus vaporized returns to the nozzle side along the collision surface and the reflux plate and circulates in the vaporization chamber, so that the vaporization chamber is maintained at a high temperature and the vaporization of the ejected liquid fuel is promoted. The remainder of the vaporized fuel flows along the vaporization wall at a location away from the liquid fuel ejection path. In other words, the vaporized fuel flows in a part where there is no return plate and where there is no return plate, so that the return plate does not become a passage resistance, and the liquid fuel passage hole is greatly opened to allow the vaporized fuel to pass therethrough. There is no need.
Therefore, the liquid fuel that has fallen without reaching the vaporization wall or the liquid fuel that bounced off the vaporization wall is received by the return plate instead of falling to the bottom of the vaporization chamber through the liquid fuel passage hole without being vaporized, Since the gas is diffused and vaporized on the reflux plate by the high-temperature mixed gas circulating in the vaporizing chamber, the vaporization performance is improved. Further, since the reflux plate is also hot, vaporization is promoted.
[0016]
According to the oil combustor of the third aspect of the present invention having the above configuration, since the vaporization wall is curved in the vertical direction, the liquid fuel that has collided with the vaporization wall not only flows down due to gravity but also the primary air. As a result, the gas is pushed down along the curved surface of the vaporization wall and diffuses well. As a result, the liquid film of the liquid fuel on the vaporization wall becomes very thin, and heat is well transferred and vaporizes well, and the vaporization area can be used effectively, so that the vaporization efficiency is improved. Further, it is difficult for liquid fuel to collect in the corner of the vaporization wall, and vaporization can be further promoted.
[0017]
According to the oil combustor of the present invention having the above-described configuration, the vaporization wall is curved in the left-right direction, so that the liquid fuel is easily diffused in the left-right direction and the vaporization efficiency is improved. Further, it is difficult for liquid fuel to collect in the corner of the vaporization wall, and vaporization can be further promoted.
[0018]
According to the oil combustor of the fifth aspect of the present invention having the above configuration, since the vaporization wall is curved in a spherical shape, the liquid fuel diffuses very well over the entire vaporization wall in the vertical and horizontal directions. As a result, the liquid film of the liquid fuel on the vaporization wall becomes thinner and vaporizes better, and the entire vaporization wall is used more effectively as a vaporization surface, and the vaporization efficiency is further improved. Further, since the spherical vaporization wall has no corners, liquid fuel hardly accumulates, and vaporization can be further promoted.
[0019]
According to the oil combustor of the present invention having the above-described configuration, even if the liquid fuel cannot be completely vaporized and flows down to the lower end of the vaporization wall, the lower end of the vaporization wall is cut in the horizontal direction, Since the lower end of the liquid crystal is bent toward the inside of the vaporization chamber, the surface tension of the liquid fuel is reduced and the liquid film is thinned. For this reason, the liquid fuel is vaporized by contact with a high-temperature mixed gas, and the vaporization efficiency is further improved.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of a water heater provided with the oil combustor of the present invention will be described below with reference to FIGS.
The oil vaporization combustion type water heater 20 (hereinafter simply referred to as the “water heater 20”) includes a vaporization unit 30 that vaporizes kerosene, a combustion unit 25 that combusts a mixed gas of vaporized kerosene and air, and combustion heat of the combustion unit 25. And a fan 40 that is driven by a motor 41 and forcibly feeds air to the vaporization unit 30 and the combustion unit 25.
[0022]
The vaporization unit 30 includes a vaporization chamber 31 that heats and vaporizes kerosene, and a distribution chamber 38 that is provided in communication with the vaporization chamber 31 directly below.
The vaporization chamber 31 is made of aluminum die-casting, in which the left and right side walls 34, the ceiling wall 45, and the collision wall 46 on the rear surface (right side in FIG. 1) are integrated, and the front opening is covered with the front wall 32, A back wall 48 is provided at the rear of the collision wall 46 with a flat ceramic heater 56 interposed therebetween. In the upper part of the front wall 32, an inflow port 33 is opened.
The collision wall 46 is formed so as to face the front wall 32 and bend into a gentle cylindrical inner surface so as to be positioned forward in the lower part and smoothly connect to the flat ceiling wall 45. That is, the corner 62 between the collision wall 46 and the ceiling wall 45 is rounded. Similarly, the corner 61 between the collision wall 46 and the left and right side walls 34 and the corner 60 between the ceiling wall 45 and the left and right side walls 34 are also rounded. The lower end of the curved collision wall 46 is cut horizontally and the tip is sharpened.
[0023]
Further, a reflux plate 35 having a semicircular shape with a side cross-section opened upward and having a width that is about half of the width of the vaporization chamber 31 is provided at the upper center portion in the vaporization chamber 31. Is in contact with the front wall 32 at a position slightly lower than the lower end of the inflow port 33, while the upper end of the back portion is provided in contact with the upper center portion of the collision wall 46. Therefore, the side cross section of the upper center portion of the vaporizing chamber 31 is formed in an arc shape by the collision wall 46 and the reflux plate 35 as shown in FIG. An opening 35 a serving as a kerosene passage hole is formed in the reflux plate 35 at the center of the contact portion with the collision wall 46.
On the other hand, as shown in FIG. 2, a mixed gas vent 36 is formed between the left and right side walls 34 and the reflux plate 35.
[0024]
One nozzle 52 for ejecting liquid kerosene is provided at the inlet 33 of the vaporizing chamber 31 so as to face the upper portion of the collision wall 46. At the tip of this nozzle 52, one jet port 53 for jetting kerosene toward the collision wall 46 is opened one by one on the left and right. The nozzle 52 is connected to a supply pipe 54 that communicates with a fuel supply source (not shown).
[0025]
A plurality of heat absorption fins 58 extending in the outer depth direction are arranged in parallel in the width direction on the back wall 48 of the vaporization chamber 31. The fins 58 extend in the vertical direction from the ceiling wall 45 of the vaporizing chamber 31 to slightly above the bottom of the vaporizing chamber 31.
In front of the vaporizing chamber 31, an air passage 42 communicating with the inflow port 33 and the fan 40 is provided.
[0026]
The combustion unit 25 is provided behind the vaporization unit 30, and is formed by a burner assembly 22 incorporating a plurality of burners, and a combustion chamber 39 that forms a combustion space above the burner assembly 22. The burner assembly 22 is provided with a plurality of main burners 24 arranged in parallel at the center of a rectangular box-shaped frame body 37. In FIG. 2, the illustration of the left main burner 24 is partially omitted, and in FIG. 3, the illustration of the central main burner 24 is partially omitted.
[0027]
Each main burner 24 is a Bunsen burner that is formed in a narrow flat shape with slit-shaped flame openings 27 opened in parallel, and is arranged in a frame 37 side by side in the left-right direction.
An ignition electrode 50 is provided in the vicinity of the right main burner 24, and a frame rod 51 is provided in the vicinity of the left main burner 24.
A distribution chamber 38 is provided below the vaporization chamber 31 in order to supply the main burner 24 with kerosene vaporized by the vaporization unit 30 described above. The distribution chamber 38 has a T-shape extending forward from the bottom of the vaporization chamber 31 and branching left and right, and communicates with a fuel inlet (not shown) of each main burner 24.
Below each main burner 24, a burner bottom plate 28 for distributing secondary combustion air is provided, and a secondary air inlet 29 is opened.
[0028]
Each fin 58 provided on the back wall 48 of the vaporization chamber 31 is disposed between the main burners 24 and extends to the lower side of the flame port 27 surface of the main burner 24. Inside the frame 37 in which the main burner 24 is disposed, a cooling hole 44 for cooling the wall surface of the combustion chamber 39 by supplying air from the fan 40 directly to the combustion chamber 39 is provided on the outer periphery of the main burner 24. .
[0029]
In the water heater 20 configured as described above, the combustion primary air supplied through the air passage 42 by the fan 40 is introduced into the vaporization chamber 31 from the inlet 33 and flows toward the collision wall 46.
On the other hand, the kerosene supplied from the supply pipe 54 is ejected from the nozzle 52 toward the collision wall 46, hits the collision wall 46, and then not only is pushed down by the primary air introduced together but also left and right side walls. 34 and the ceiling wall 45 smoothly flow and diffuse thinly in a wide range in the horizontal direction and the vertical direction.
The kerosene jetted in the center passes through the opening 35a of the reflux plate 35 when flowing down to the lower part of the collision wall 46, as indicated by a broken line in FIG. On the other hand, the kerosene ejected in the vicinity of the left and right sides of the reflux plate 35 diffuses while simply flowing down along the collision wall 46, as indicated by broken lines in FIG. Hereinafter, the collision wall 46, the left and right side walls 34, and the ceiling wall 45 are referred to as a vaporization surface 47.
The kerosene diffusing on the vaporization surface 47 heated by the heater 56 becomes very thin and vaporizes well, and mixes with the primary air.
[0030]
A part of the mixed gas (in the center of the vaporization chamber 31) returns to the front nozzle 52 along the curved return plate 35 as shown by a solid line in FIG. It circulates in the upper part of the vaporization chamber 31 surrounded by the wall 46 and the ceiling wall 45 in a cylindrical shape to maintain the vaporization chamber 31 at a high temperature and promote vaporization.
The remaining mixed gas (the left and right sides of the vaporization chamber 31) passes through the mixed gas passages 36 on the left and right outer sides of the reflux plate 35 to the lower distribution chamber 38 along the vaporization surface 47 as shown by the solid line in FIG. After entering and diverting to the left and right, it is guided to the main burner 24 behind the distribution chamber 38.
This mixed gas is ignited by the ignition electrode 50, moves from the right main burner 24 to the left main burner 24, and continues to burn under the detection of flame by the frame rod 51. At this time, secondary air is supplied from the secondary air inlet 29 and burns well.
[0031]
The combustion heat heats the water through the heat exchanger, and at the same time, the vaporization surface 47 and the fins 58 of the vaporization chamber 31 are heated, and the kerosene is vaporized well. In particular, a part of the combustion heat is recovered from the upper part of the fin 58 and the vaporization surface 47 is heated and vaporized.
Below the combustion chamber 39, the secondary air is heated in contact with the lower portion of the fin 58 when passing between the main burners 24, so even if the secondary air flows upward from the main burner 24, The upper part of the fin 58 can be kept at a high temperature without being cooled, and the vaporization surface 47 can be heated well to promote the vaporization of kerosene.
In this way, even if the heater 56 is turned off, the entire vaporization surface 47 can be uniformly heated by the fins 58, so that local low temperature is prevented and kerosene is vaporized well.
The temperature of the case of the combustion chamber 39 is prevented by the air supplied from the fan 40 through the cooling hole 44 to the combustion chamber 39.
[0032]
According to the hot water heater 20 described above, the following effects can be obtained.
1. Since the entire vaporization surface 47 of the vaporization chamber 31 is curved, unvaporized kerosene does not stay between the ceiling wall 45 and the collision wall 46 or between the left and right side walls 34 and the collision wall 46. The liquid film spreads and becomes thin and vaporizes well.
2. Since the portion of the collision wall 46 where the kerosene collides is curved, the rebound of the kerosene that collides with the collision wall 46 is suppressed, and the kerosene diffuses well not only in the left-right direction but also in the vertical direction. The liquid film becomes very thin and is well-heated and vaporizes well, and the vaporization area can be used more effectively, so that the vaporization efficiency is further improved.
[0033]
3. Since kerosene and primary air flow together in the vaporization chamber 31, the collided kerosene is swept along the vaporized surface 47 curved by the primary air and diffuses throughout the vaporized surface 47.
As a result, kerosene is unlikely to accumulate on the vaporization surface 47, and the kerosene is thinned to improve vaporization performance. Moreover, the primary air flows in contact with the surface of kerosene and vaporizes the kerosene satisfactorily by mass transfer heat transfer, and the vaporization area can be used effectively, so the vaporization efficiency is increased.
4). Since the high-temperature mixed gas is circulated in the vaporization chamber 31 by the reflux plate 35, the vaporization chamber 31 is maintained at a high temperature to promote vaporization.
[0034]
5. Even if the amount of kerosene ejected is so large that it bounces off the collision wall 46, the kerosene does not fall into the distribution chamber 38 without being vaporized, but falls onto the reflux plate 35 and circulates at a high temperature. As a result, the gas diffuses well on the reflux plate 35 and vaporizes well, so that the vaporization performance can be improved. Moreover, since the reflux plate 35 is also high temperature, vaporization is accelerated.
6). Conversely, the amount of kerosene ejected is small, and even if it falls on the reflux plate 35 before reaching the collision wall 46, it vaporizes well and the same effect as 5 is obtained.
[0035]
7). Since the opening 35a is formed in the reflux plate 35, the kerosene ejected in the center hardly accumulates on the reflux plate 35 and flows down to the lower part of the collision wall 46 through the opening 35a, so that the entire collision wall 46 is vaporized. As a result, the vaporization unit 30 can be made compact.
[0036]
8). Since the lower end of the collision wall 46 is sharp, even if kerosene does not completely evaporate and flows down to the lower end of the collision wall 46, the kerosene surface tension is reduced at the sharpened lower end. The film becomes thinner and vaporizes in contact with a high temperature mixed gas, further improving the vaporization efficiency.
[0037]
9. Since the fins 58 provided on the back wall 48 extend below the surface of the flame outlet 27 of the main burner 24, the upper part of the fins 58 can be prevented from being cooled by the secondary air. Since the collision wall 46 receives heat from the upper part of the fin 58, the vaporization of kerosene can be promoted by the fin 58 having a low lower end position.
10. Since the flat heater 56 is heated in contact with the entire collision wall 46, the start-up at the start of the combustion operation can be accelerated.
11. Since the mixed gas passage port 36 is formed on the left and right outer sides of the reflux plate 35, the amount of the mixed gas passing through the vaporizing chamber 31 can be maintained appropriately, and the opening 35 a serving as a kerosene passage hole is formed in the reflux plate 35. Therefore, the mixed gas flowing in the center does not pass through the opening 35a and is favorably refluxed in the upper portion of the vaporizing chamber 31. In addition, since the opening 35a is formed in an appropriate size, neither kerosene bounced off the collision wall 46 nor kerosene dropped on the return plate 35 before reaching the collision wall 46 passes through the opening 35a. It is received by the reflux plate 35 without falling to the bottom of the vaporization chamber 31 and can be vaporized on the reflux plate 35.
[0038]
As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, in the range which does not deviate from the summary of this invention, it can implement in various aspects.
[0039]
For example, the vaporizing surface 47 may be curved into a spherical inner surface instead of being configured with a cylindrical inner surface. In this case, kerosene diffuses very well vertically and horizontally on the spherical vaporization surface. As a result, the liquid film of kerosene on the vaporization surface is further thinned and vaporizes well, and the entire inner surface of the vaporization chamber is more effectively used as the vaporization surface, and the vaporization efficiency is further improved.
In addition, since this spherical vaporized surface is continuously curved from the ceiling to the rear surface and the left and right surfaces, the kerosene is difficult to accumulate on the vaporized surface and vaporizes well.
[0040]
Also in the configuration of the reflux plate 35, the reflux plate 35 may be provided at a position shifted from the passage of kerosene, instead of being provided directly below the passage of kerosene ejected from the nozzle 52 to the collision wall 46. Even in this case, the mixed gas circulates in the vaporizing chamber 31 and contributes to an increase in the temperature of the vaporizing chamber 31 to improve the vaporization efficiency.
Further, the width of the reflux plate 35 may be equal to the width of the vaporizing chamber 31.
[0041]
Further, in the vaporization chamber formed by bending the vaporization surface in the left-right direction, the nozzle may be provided to be shifted to the left (or right) from the central axis of the curved vaporization surface. In this case, the kerosene ejected toward the left side of the vaporization surface diffuses to the right side of the vaporization surface while turning along the curved vaporization surface. On the other hand, primary air introduced from the periphery of the nozzle toward the collision surface on the left side of the vaporization surface swirls along the vaporization surface in the same manner as kerosene, and pushes kerosene to the right end of the vaporization surface. In this way, kerosene diffuses throughout the vaporized surface while effectively utilizing the area of the vaporized surface, and vaporizes well.
[0042]
【The invention's effect】
As described above in detail, according to the oil combustor according to claim 1 of the present invention, the liquid fuel and the primary air for combustion flow together toward the curved collision surface. Suppress bounce and stay.
Further, since the liquid fuel is thinly diffused over the entire vaporization wall while effectively using the vaporization area, the vaporization efficiency is improved.
Further, since the vaporization section is provided with the reflux plate, the circulating mixed gas maintains the vaporization chamber at a high temperature and promotes the vaporization of the liquid fuel.
[0043]
Furthermore, according to the oil combustor of claim 2 of the present invention, the liquid fuel that has not reached the vaporization wall or the liquid fuel that bounced off the vaporization wall can be vaporized on the reflux plate, and the vaporization efficiency is improved.
Further, since the liquid fuel passage hole is opened in the vicinity of the vaporization wall in the reflux plate, the liquid fuel that has reached the vaporization wall in the vicinity of the reflux plate is less likely to accumulate on the reflux plate and flows down at the lower part of the vaporization wall, and is vaporized well. Vaporization efficiency is further improved.
[0044]
Furthermore, according to the oil combustor of claim 3 of the present invention, since the vaporization wall is bent in the vertical direction, the liquid fuel is further diffused downward on the vaporization wall, and the liquid film becomes very thin. Vaporization area can be used effectively and vaporization efficiency is improved.
[0045]
Furthermore, according to the oil combustor of claim 4 of the present invention, since the vaporization wall is curved in the left-right direction, the collided liquid fuel is unlikely to collect in the corner of the vaporization wall, and the vaporized wall is thinly diffused and satisfactorily vaporized. And vaporization efficiency is improved.
[0046]
Furthermore, according to the oil combustor of claim 5 of the present invention, since the vaporization wall is curved into a spherical shape, the liquid fuel diffuses very well over the entire vaporization wall in the vertical and horizontal directions.
As a result, the liquid film of the liquid fuel on the vaporization wall becomes thinner and vaporizes better, and the entire vaporization wall is used more effectively as a vaporization surface, and the vaporization efficiency is further improved.
Further, since the spherical vaporization wall has no corners, liquid fuel hardly accumulates, and vaporization can be further promoted.
[0047]
Furthermore, according to the oil combustor of claim 6 of the present invention, the lower end of the vaporization wall is cut in the horizontal direction, and the lower end of the vaporization wall is formed to be pointed inward of the vaporization chamber. The fuel is easily vaporized at the lower end, and the vaporization efficiency is further improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an oil combustor as an embodiment as viewed from the side.
FIG. 2 is a cross-sectional view of an oil combustor as one embodiment as viewed from above.
FIG. 3 is a sectional view of an oil combustor as one embodiment as viewed from the front.
FIG. 4 is a cross-sectional view of a vaporization chamber as one embodiment as viewed from the side.
FIG. 5 is a cross-sectional view of a vaporization chamber as one embodiment as viewed from the side.
FIG. 6 is a cross-sectional view of a conventional oil combustor as seen from the side.
FIG. 7 is a cross-sectional view seen from the side of a conventional oil combustor.
[Explanation of symbols]
22 ... Burner assembly, 24 ... Main burner, 25 ... Combustion section, 27 ... Flame port, 30 ... Vaporization section, 31 ... Vaporization chamber, 32 ... Front wall, 33 ... Inlet, 34 ... Left and right side walls, 35 ... Reflux plate, 35a ... Opening, 38 ... Distribution chamber, 39 ... Combustion chamber, 40 ... Fan, 45 ... Ceiling wall, 46 ... Collision wall, 47 ... Vaporization surface, 48 ... Back wall, 52 ... Nozzle, 53 ... Jet, 56 ... Heater 58 ... Fins.

Claims (6)

Liquid fuel was ejected from the nozzle and collided with a vaporization wall provided in the vaporization chamber, and primary air for combustion was supplied to the vaporization chamber, and the liquid fuel was heated by a heater to vaporize at the vaporization wall and vaporized. A vaporizing section for introducing a mixed gas of fuel and primary combustion air to a burner;
An oil combustor comprising a combustion section for combusting a mixed gas ejected from the burner,
A reflux plate for refluxing a part of the mixed gas to the nozzle side and circulating in the vaporizing chamber is formed in the vaporizing portion along the extending direction of the curved collision surface,
Forming a collision surface of the vaporization wall with which the liquid fuel collides, on a cylindrical inner surface or a spherical inner surface that is concave and curved in the liquid fuel ejection direction;
An oil combustor, wherein the liquid fuel is pushed along the collision surface by supplying the primary air for combustion toward the curved collision surface. The reflux plate is disposed directly below the liquid fuel ejection path from the nozzle to the vaporization wall, and a liquid fuel passage hole is opened at a contact portion of the reflux plate with the collision surface. The oil combustor according to claim 1 . The oil combustor according to claim 1 or 2, wherein the vaporization wall is curved in the vertical direction so that the axis of the cylindrical inner surface extends in the horizontal direction . The oil combustor according to any one of claims 1 to 3, wherein the vaporization wall is curved in the left-right direction so that an axis of a cylindrical inner surface extends in the up-down direction . 3. The oil combustor according to claim 1, wherein the vaporizing wall is formed by curving into a spherical shape . The lower end of the curved vaporization wall is cut in the horizontal direction, and the lower end of the vaporization wall is formed to be bent toward the inside of the vaporization chamber. oil combustor.

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